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Any tips for molds

  1. #1
    Morphen Jar's Avatar
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    Any tips for molds

    I'm beginning to make a Vacuum forming table but i need to know a bit more on how to build molds.

  2. #2
    tubachris85x's Avatar
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    Re: Any tips for molds

    Hey, Im in the same boat as you, but I think one way of doing it is making the sculpt out of some hard clay, make a plaster mould of it, and then using that plaster mould, cast the vacu-form mould out of resin or some hard material of the sort...

    -tubachris

  3. #3
    Morphen Jar's Avatar
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    Re: Any tips for molds

    Ive heard of that too. Seems a bit hard doesn't it? Im no Michaelangelo!

  4. #4
    tubachris85x's Avatar
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    Re: Any tips for molds

    Im not either, and ive never done anything like it before. So, how do you make moulds?

    -tubachris

  5. #5
    Morphen Jar's Avatar
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    Re: Any tips for molds

    I dont know. Maybe....no.....If I find anything else I'll tell you.

  6. #6
    tubachris85x's Avatar
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    Re: Any tips for molds

    There are diagrams I found online that have all the pieces minus the helmet, with all the measurements, Im using that for the molds I will help make for the group Im gonna be working with soon. Fortunatly, one of them already has a vacu-form machine...

    -tubachris

  7. #7
    Morphen Jar's Avatar
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    Re: Any tips for molds

    what website is it

  8. #8
    CombatBaby's Avatar
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    Re: Any tips for molds

    mdf is cheap and easy to make molds out of. I use it to make molds for guns and things like stormtrooper/biker scout armor.

    otherwise sculpting out of clay works like a charm. Depending on what material you use, making a negative to make another (harder) positive may not be necessary.

    this should be very helpful http://www.tk560.com/stormtrooper.html

    -=QuinN!

  9. #9
    tubachris85x's Avatar
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    Re: Any tips for molds

    I always thought about using MDF for making the molds, but I dont have any wood working tools for it.

    -tubachris

  10. #10

    Re: Any tips for molds

    Consider sculpting in pink (Owens Corning) or blue (Dow Styrofoam(TM)) insulation foam, making an intermediate plaster waste mold, and casting a sturdy buck in that.

    Don't vacuum form directly over pink or blue foam. You won't crush it, but you'll scrunch any protrusions stretching plastic across it.

    There's a couple of relevant threads about this going on over at tk560.com.

    Here's one:

    http://www.tk560.com/phpBB2/viewtopic.php?t=418

    There's another thread about hot wire cutters & jigs for sculpting foam, in the vacuum forming forum.

  11. #11
    Morphen Jar's Avatar
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    Re: Any tips for molds

    What is MDF

  12. #12
    Ripcode's Avatar
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    Muskegon, Michigan
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    Re: Any tips for molds

    Morphen Jar said: View Post
    What is MDF
    Is there any particular reason why you like this smiley so much??

    <-- Smiley in question.

    ETA: Good grief... just read your profile. You are 12.

    No futher questions.

  13. #13
    tubachris85x's Avatar
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    Re: Any tips for molds

    drcrash said: View Post
    Consider sculpting in pink (Owens Corning) or blue (Dow Styrofoam(TM)) insulation foam, making an intermediate plaster waste mold, and casting a sturdy buck in that.

    Don't vacuum form directly over pink or blue foam. You won't crush it, but you'll scrunch any protrusions stretching plastic across it.

    There's a couple of relevant threads about this going on over at tk560.com.

    Here's one:

    http://www.tk560.com/phpBB2/viewtopic.php?t=418

    There's another thread about hot wire cutters & jigs for sculpting foam, in the vacuum forming forum.


    What would I use to cast the buck out of after making the waste mold from plaster? Really dense resin or some kind of liquid cement hardner?


    -tubachris

  14. #14

    Re: Any tips for molds

    tubachris85x said: View Post
    What would I use to cast the buck out of after making the waste mold from plaster? Really dense resin or some kind of liquid cement hardner?
    -tubachris
    For short run stuff, or an intermediate mold I wouldn't form directly over more than a few times, I might use something like water putty or gypsum cement, with drywall tape reinforcement.

    For something really durable, I'd probably go with a resin impression coat, and lay up some fiberglass of some sort under that. Maybe just a healthy layer of Bondo-Glass. (Which is not like regular Bondo. It's not easy to sand, and it's much stronger, because it's filled with glass fibers instead of little microbubbles.)

    If I still wanted to be able to sand and modify it easily, at the expense of making it somewhat less durable, I might start with a layer of regular Bondo. Then, deeper than I'd ever want to sand away, a healthy layer of Bondo-Glass for overall strength.

    BTW, don't trust me on this. This resin/glass stuff is all still on my to-do list, not something I've actually done. (Today I'm experimenting with hot wire cutters for the foam part... I'll get there eventually.) I have done plaster waste molds and reinforced water putty casts, but not fiberglass.

    Paul

  15. #15

    Member Since
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    Whitehorse, Yukon
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    Re: Any tips for molds

    hmmmm I don't think giving a 12 year old directions on vacuum forming is such a great idea, I didn't know you were 12 man.

  16. #16
    tubachris85x's Avatar
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    Re: Any tips for molds

    LOL, well I need it, and im 18...

    -tubachris

  17. #17
    Tim Allen's Avatar
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    Re: Any tips for molds

    You want the best way to learn to do molds. Go to the " YouTube" web site and type in Resin Molds, Mold making, or some other variation of that. They have tons upon tons of how to videos showing you the material needed to make accurate and structural sound molds.

  18. #18

    Re: Any tips for molds

    I dunno, I was using an electric saw (portable jigsaw) when I was 12. I don't see vacuum forming as being that dangerous. You might get a painful burn, but probably nothing disfiguring or even permanent, and you probably won't cut off any appendages. The most dangerous part is trimming the plastic with Sharp Things.

    Whether it's something a 12-year-old ought to be doing depends a whole lot on the 12-year-old.

  19. #19

    Member Since
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    Re: Any tips for molds

    Umm you have to put plastic in your oven. I think thats a bit more dangerous than using a jigsaw. The only people I've seen get hurt with a jigsaw were really stupid. It's practiaccly impossible to hurt yourself with one unless you're trying to.

  20. #20

    Member Since
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    Re: Any tips for molds

    Also, any vacuum forming molds have to taper outward towars the bottom and have no "lips" for the plastic to get caught on. The most tricky part of it is designing you molds to get around this issue.

  21. #21
    Morphen Jar's Avatar
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    Re: Any tips for molds

    Hey I could do it! I'm more carful than that! But all !12 year olds are under estimated.

  22. #22

    Re: Any tips for molds

    I don't think careful is the issue here. The big one would be do you have experience? As in experience with potentially dangerous power tools and access and knowledge of safety equipment to use against dust and fumes. I'm a careful person, but does that mean I want to dive right into foundry work, dealing with molten hot metals without experience? Nope.

  23. #23
    Morphen Jar's Avatar
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    Re: Any tips for molds

    Im pretty expeirienced and im smart.

  24. #24
    TeamFett's Avatar
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    Re: Any tips for molds

    Please stop using that smiley. It's very annoying.

  25. #25
    Morphen Jar's Avatar
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    Re: Any tips for molds

    Fine

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